linux-kernel - [PATCH 4.9 074/120] drm/i915/gen9: Fix PCODE polling timeout in stable backport

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Date:   Wed, 18 Jan 2017 11:46:32 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org, Thomas Backlund <tmb@...eia.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Imre Deak <imre.deak@...el.com>
Subject: [PATCH 4.9 074/120] drm/i915/gen9: Fix PCODE polling timeout in stable backport

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Imre Deak <imre.deak@...el.com>

The backport of
2c7d0602c - "Fix PCODE polling during CDCLK change notification"
to the 4.9 stable tree used an incorrect timeout value. Fix this up
so the backport matches the upstream commit.

Reported-by: Thomas Backlund <tmb@...eia.org>
Signed-off-by: Imre Deak <imre.deak@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/gpu/drm/i915/intel_pm.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -8015,14 +8015,14 @@ int skl_pcode_request(struct drm_i915_pr
 	 * worst case) _and_ PCODE was busy for some reason even after a
 	 * (queued) request and @timeout_base_ms delay. As a workaround retry
 	 * the poll with preemption disabled to maximize the number of
-	 * requests. Increase the timeout from @timeout_base_ms to 50ms to
+	 * requests. Increase the timeout from @timeout_base_ms to 10ms to
 	 * account for interrupts that could reduce the number of these
 	 * requests.
 	 */
 	DRM_DEBUG_KMS("PCODE timeout, retrying with preemption disabled\n");
 	WARN_ON_ONCE(timeout_base_ms > 3);
 	preempt_disable();
-	ret = wait_for_atomic(COND, 50);
+	ret = wait_for_atomic(COND, 10);
 	preempt_enable();
 
 out: